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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3a047ba76a0b33f7b96399c51436c3dfe16579683d1018069bfaca35087ce1' 
  AND token = '28i3GTw7ZlDgElDnsT4ixoq3fRktHNnVm4TTwGSJ4is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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