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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2e4db562da8ae0beb79d302fa211876d486edb22609ab3b362666349b1cfdf' 
  AND token = 'OtfG3d1HSa+jtwRsRnJKt8x3FyjmDsg2og1EJv6s6sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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