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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caec15824484a7410e0be5caab2cbe1a4a851785deaad41111000b36782c78ce' 
  AND token = 'aSNHfo4v3Amdo/DSq0PpsK7d2AX7xeVsJg4KcO+1UPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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