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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e617c2dd46496349f6ad38a3ec54ef35fef0660d98e67d783708cc74e5342bac' 
  AND token = 'urZhdQmSnAdmvXhLjbL7x8VMRq+TD1c64I7CMgAHMsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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