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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919d60e802bb5af034739df761433b2849a8bf9e45fd5a5546c009205ef423fa' 
  AND token = 'Y3utdgTNk64krVx7D0sFPqTmIZn8SbX11U86hYvHbvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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