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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae1f48ba48c551f7d3f0c02b4de015c40fc9c2b12f348ed522e8ca4bebb92f8' 
  AND token = 'sm2mMgPUBQmic5ewK7voUu3pESpVJtOwN2CwyCJA748=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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