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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb903913c06e54ea266bfa693687333a5a051b294dabf569c9b769fed13d73e' 
  AND token = 'cV4mTn5sFtUzjbGpi8Dr9t3D17kX4BD6vmfL+8vJqSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}