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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef3a2a71a11c11f48fa263fcc21c3a84d972d3f43a84891d2c359b01a520b32' 
  AND token = '77uLDNouN0qa5qtIUQnxUeG6/40W0PC1VLeZtbnedsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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