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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f79a6e7c5a5996b0025787915e5cd1f9b3759de63407f191a219b5ebb7a235' 
  AND token = 'YFQ9ehG2f9LP7kS5kZgwoBe7fjc5MpNxX4ZUfY226Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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