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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7745bd989fba8dd6609841a103ad61734c5d8c46d77d5fc5120e26324d3b22d' 
  AND token = '0eFOs46xeM8sfe8fdwibUozdo+OTvFzhpQbIHYttwtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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