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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57b519f42e5354a7fb121431e330946a053669ea0bf12615f83d2cc5bdab8e2' 
  AND token = 'l7t71i2Vu8l/8tMl1djo9bhQBp1EzoNI1DrEK5EauTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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