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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f023db4d27be5c271339a5f9a127760b1799bfb757d0b2414fa75e5f8133f6' 
  AND token = 'eex7C+oTR2ZmtzVNB8aI+bKbT31PPD67ivH36Sgqz78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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