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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba42a41d3e436ff4514d804a709717ffebde532caec6141970b8689133d4d39' 
  AND token = 'fkIlB2+Lw980nXR0Hi6FU5VbJaoa1VpyB8l4gsb8oNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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