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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd298e95777a3d4571885ef1ea95495a30d8751465659a6f0d63daeb536b030' 
  AND token = 'wCUeA0CsVidnC0yW818DPUMGXZwTHCpbdCxN/W6CYS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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