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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32adc01e3c6c7e9852a4b9f80eb2d03fccbc6dc2d0eba1c058c451f33a4dcbaf' 
  AND token = 'EdFaVQqBLcgBed/RHM68UVMGWDIJ0x1dtUNR6+i1A/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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