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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e4c09fe5281c1e2d1a135342a0205dde07d7659876d92c302527b8ad93907a' 
  AND token = 'F9GiGwcdPCx+WAxdIb+ZlrxDzY1U5oQksVtlb5rhUm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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