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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da4fa581a6db38e220fc161b6cd976c8bd04d43f6955f214b14ad4b515d779e' 
  AND token = 'X0/JSKQaEDLewT1Yw2C1ycOaDaBh+RcwAEVFHrS35aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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