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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642015df64452742573a0e00084a315d05c6f580042cb3bf45414e13dbb701bf' 
  AND token = 'y307MmcHhoqP3fjcMy658Um9hAfDMhdvB7eSW2PMwIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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