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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9efa5c55894af0be4f0d88b00c92db030a314a27dc6c72127c8a13a4579440' 
  AND token = 'kBPvCwXfhwoNgeUp7mEZIZYbWlD0tBP6a4znB1TlN3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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