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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9b5971f3b4c6b51c34224856e3a0b1b78e3a1f28e5162393ce0e7f12520ca0' 
  AND token = 'p6o06y1N3YImmVVPi5Mh85xRHk3vNvrjiQwUBxeBAMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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