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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff2ea30cf45b1f5817478d97d6728e8809fb7011a0f7bc0891f8b2f894f4784' 
  AND token = '84S7kVziWajojKaAe8yD4sPIoxq/VJHI90fauIzqylU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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