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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77847cf36efdc00ca4ecdcfc6aa23fb02ba7aaf3153dc9b68652ba35ea3ae61a' 
  AND token = 'kcEv/sRFfFwtY3mR0pOFY0Kn2ikOZJCRLQ8AKnPdp+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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