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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8621e37dabcd88787912f877913d1e3b458fd531d064b8baaad06d4b1730a0c' 
  AND token = 'meFMwyatd1z1rlTIAouqj9NScGnJFw08rv1I4lBhP4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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