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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd101d3c49b0174f6ed8d7343c8e7ae803ac06542a2e13118fe1662e0a007cdd' 
  AND token = '6rbMBHotUpUkajvrK5vh6O2P5mHVydXHom10qfZUCL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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