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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b019ad9dd032fe31d1a59bf56d502841b9abc7105738c77c22a7c0138c1808ef' 
  AND token = 'bCiGGLPBte5blZ4Ev5TeDaZ2hs6Be70ZB1P4BurhRiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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