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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4308e30d2690caf8a2ec7d2109e6f6524ee0e9d9e79de264cad64b78341bf001' 
  AND token = 'jWYG4vX0VY8rZa2ETShme63G0tfhZQN+RclheU65i5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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