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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9703d2fa5e6e6ff423433b8e6bf773d2e8dd16c8281d3b8bf7a3a9f80d46ae01' 
  AND token = 'Yk8emJQZLHJkq/TmdBKNcYFGBs4ildga07om4n39i7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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