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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac40565a9825ba8d26e23cbd43f5047023b61ba6e4a1375023c0b334f11274f' 
  AND token = 'K1/xG6NTAxGllA4Pn4G0uysZ75Z5sJ3O0VcV6PjJeEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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