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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87f7d8b3a438a3809c408651e6fe1b8f0c9902c03c67994dab6ec7914eda083' 
  AND token = 'VIaEl/Le7Ry5kSeCLtq6Ddcvi3y+bx26bDEfpz81ROc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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