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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9d1c29de79ad86f5487c41b40d03d38b32d8bf79c1d525ddd0a830d0767249' 
  AND token = 'NI0/Lmglg49ZOX8asCm40RMhTPbSDOMrNGFt/AZtcTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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