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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86975ec546924ddad4f21dcab86561e68d7e0ef8405a25daf677170400b9675' 
  AND token = 'sImOd3e/L8lSpAi8mldC4EIJnb0GLMUlbwspunOltkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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